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From "Avery Ching (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-302) Thread safety issue with sending partitions around
Date Fri, 17 Aug 2012 08:14:38 GMT
Avery Ching created GIRAPH-302:
----------------------------------

             Summary: Thread safety issue with sending partitions around
                 Key: GIRAPH-302
                 URL: https://issues.apache.org/jira/browse/GIRAPH-302
             Project: Giraph
          Issue Type: Bug
         Environment: When calling sendPartitionRequest(), we clear the vertex list afterward,
making it a race!

I noticed this when I was running with 300 workers and the number of edges wasn't what I expected.
 Sometimes we get empty requests!

After digging into the code I found the issue and have fixed it.

Giraph Stats   Aggregate edges   99,971,220              0      99,971,220
Superstep      11        0       11
Current workers          300     0      300
Last checkpointed superstep      0      0       0
Current master task partition    0      0       0
Sent messages  0    0            0
Aggregate finished vertices      10,000,000     0       10,000,000
Aggregate vertices               10,000,000     0       10,000,000

This is wrong!

Giraph Stats    Aggregate edges         100,000,000     0       100,000,000
Superstep       11        0             11
Last checkpointed superstep             0       0       0
Current workers   300                   0       300
Current master task partition           0       0       0
Sent messages  0    0                   0
Aggregate finished vertices             10,000,000      0       10,000,000
Aggregate vertices                      10,000,000      0       10,000,000

Fixed!
            Reporter: Avery Ching
            Assignee: Avery Ching
            Priority: Critical




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